Reminds me of Tentacle Wars, which was a favourite game of mine growing up so I'm inclined to like this genre of game. I really liked this game, though an idea I had while playing that could improve it is the ability to add in a supply route that would constantly build up the forces of a target fortress.
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That was the idea I was going for, I really enjoyed that game too.
The AI can absolutely be improved. I was starting to overthink the whole AI and I have a bunch of useless checks in it now but if I keep working on it, it can become good I think. I've finished a more polished one (visually that is) which I'll put up once the rating is over.